<template>
<div class="app-container">
    <el-form label-width="120px">
        <el-form-item label="信息描述">
            <el-tag type="info">excel模版说明</el-tag>
            <el-tag>
                <i class="el-icon-download" />
                <a :href="'/static/demo.xlsx'">点击下载模版</a>
            </el-tag>
        </el-form-item>

        <el-form-item label="选择Excel">
            <el-upload ref="upload" :auto-upload="false" :on-success="fileUploadSuccess" :on-error="fileUploadError" :disabled="importBtnDisabled" :limit="1" :action="BASE_API+'/eduservice/subject/addSubject'" name="file" accept="application/vnd.ms-excel">
                <!--文件格式只能是xlsx-->
                <el-button slot="trigger" size="small" type="primary">选取文件</el-button>
                <el-button :loading="loading" style="margin-left: 10px;" size="small" type="success" @click="submitUpload">上传到服务器</el-button>
            </el-upload>
        </el-form-item>
    </el-form>
</div>
</template>

<script>
export default {
    data() {
        return {
            BASE_API: process.env.BASE_API, //接口API地址
            importBtnDisabled: false, //按钮是否禁用
            loading: false,
        };
    },
    created() {},
    methods: {
        submitUpload() {
            //点击上传按钮触发的函数 注意:这个不是ajax提交是表单提交
            this.importBtnDisabled = true;
            this.loading = true;
            //相当于js中的:documnet.getElementById("upload").submit()
            this.$refs.upload.submit();
        },
        fileUploadSuccess() {
            //上传成功执行
            this.loading = false;
            this.$message({
                type: "success",
                message: "添加课程分类成功",
            });
            //路由跳转到课程分类列表
            this.$router.push({
                path: "/subject/list",
            });
        },
        fileUploadError() {
            //上传失败
            this.loading = false;
            this.$message({
                type: "error",
                message: "添加课程分类失败",
            });
        },
    },
};
</script>
